[OpenMP] Implement omp_is_initial_device() as builtin

This allows to return the static value that we know at compile time.

Differential Revision: https://reviews.llvm.org/D38968

llvm-svn: 316001

1 files changed, 36 insertions, 0 deletions

diff --git a/clang/test/OpenMP/is_initial_device.c b/clang/test/OpenMP/is_initial_device.c
new file mode 100644
index 00000000000..0521f0bd539
--- /dev/null
+++ b/clang/test/OpenMP/is_initial_device.c
@@ -0,0 +1,36 @@
+// REQUIRES: powerpc-registered-target
+
+// RUN: %clang_cc1 -verify -fopenmp -x c -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-unknown-unknown \
+// RUN:            -emit-llvm-bc %s -o %t-ppc-host.bc
+// RUN: %clang_cc1 -verify -fopenmp -x ir -triple powerpc64le-unknown-unknown -emit-llvm \
+// RUN:             %t-ppc-host.bc -o - | FileCheck %s -check-prefixes HOST,OUTLINED
+// RUN: %clang_cc1 -verify -fopenmp -x c -triple powerpc64le-unknown-unknown -emit-llvm -fopenmp-is-device \
+// RUN:             %s -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s -check-prefixes DEVICE,OUTLINED
+
+// expected-no-diagnostics
+int check() {
+  int host = omp_is_initial_device();
+  int device;
+#pragma omp target map(tofrom: device)
+  {
+    device = omp_is_initial_device();
+  }
+
+  return host + device;
+}
+
+// The host should get a value of 1:
+// HOST: define{{.*}} @check()
+// HOST: [[HOST:%.*]] = alloca i32
+// HOST: store i32 1, i32* [[HOST]]
+
+// OUTLINED: define{{.*}} @{{.*}}omp_offloading{{.*}}(i32*{{.*}} [[DEVICE_ARGUMENT:%.*]])
+// OUTLINED: [[DEVICE_ADDR_STORAGE:%.*]] = alloca i32*
+// OUTLINED: store i32* [[DEVICE_ARGUMENT]], i32** [[DEVICE_ADDR_STORAGE]]
+// OUTLINED: [[DEVICE_ADDR:%.*]] = load i32*, i32** [[DEVICE_ADDR_STORAGE]]
+
+// The outlined function that is called as fallback also runs on the host:
+// HOST: store i32 1, i32* [[DEVICE_ADDR]]
+
+// The device should get a value of 0:
+// DEVICE: store i32 0, i32* [[DEVICE_ADDR]]